In this article we will discuss about:- 1. Meaning of Phase Diagram 2. Type of Phase Diagram 3. Various Type of Phase Diagram Reaction 4. Congruent Phase Transformations 5. Influence of Alloying Elements. Meaning of Phase Diagram: A phase diagram is also called an equilibrium or constitutional diagram. It shows the relationship between temperature, the compositions and the quantities of [...]
The Iron-Iron carbide (Fe-Fe3C) is defined by five individual phases and four invariant reactions. Five phases are- α-ferrite (BCC) Fe-C solid solution, γ-austenite (FCC) Fe-C solid solution, δ -ferrite (BCC) Fe-C solid solution, Fe3C (iron carbide) or cementite - an inter- metallic compound and liquid Fe-C solution. Four invariant reactions are eutectoid, eutectic, monotectic and peritectic. As shown in figure [...]
In this article we will discuss about:- 1. Introduction to TTT Diagrams 2. Effect of Alloying Elements on TTT Curve 3. Limitations. Introduction to TTT Diagrams: Solid state transformations, which are very important in steels, are known to be dependent on time at a particular temperature, as shown in figure. Isothermal transformation diagram, also called as TTT diagram, measures the [...]